text: There are many alternative wastewater treatment systems that can be used in place of MBBRs. The selection of the appropriate system depends on the wastewater coming in, treatment objectives, available space, and budgets.
  Some other options are:
  * Sequencing Batch Reactors (SBR)
  * Membrane Bioreactors (MBRs)
  * Fixed Film Systems
  * Integrated Fixed-Film Activated Sludge (IFAS)
  * Submerged Aerated Filters (SAFs)
  * Rotating Biological Contactors (RBCs)